Recently, two of my forum members stopped seeing new posts that are made. To be precise, they can see that someone has written new post but the icon in the forum doesn't change and only two of them have that problem, everyone else seems ok.

Just so you can visualize, when someone makes new post, the icon should go green as in the picture below but these two members always see it as gray.

OK, cookies helped for 1 member but the other still had problems so I created a new forum group and put her (with all the others) in it and now everything works like a charm. Ty for helping, will reopen the topic if same problem occurs again.